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CCIE Essential 1st. GNS3 (Graphical Network Simulator)
GNS3 is a Graphical Network Simulator that allows emulation of complex networks. It is great tool to evaluate Cisco network and prepare Cisco exam such as CCIE.
There are a number of router simulators on the market, but they are limited to the commands that the developer chooses to include. Almost always there are commands or parameters that are not supported when working on a practice lab. In these simulators you are only seeing a representation of the output of a simulated router. The accuracy of that representation is only as good as the developer makes it. With GNS3 you are running an actual Cisco IOS, so you will see exactly what the IOS produces and will have access to any command or parameter supported by the IOS. In addition, GNS3 is an open source, free program for you to use. However, due to licensing restrictions, you will have to provide your own Cisco IOSs to use with GNS3. Also, GNS3 will provide around 1,000 packets per second throughput in a virtual environment. A normal router will provide a hundred to a thousand times greater throughput. GNS3 does not take the place of a real router, but is meant to be a tool for learning and testing in a lab environment. Using GNS3 in any other way would be considered improper.
GNS3 was developed primarily by Jeremy Grossmann. Additional developers involved in creating GNS3 are David Ruiz, Romain Lamaison, Aurélien Levesque, and Xavier Alt. Dynamips was developed by Christophe Fillot. Dynagen's primary developer was Greg Anuzelli. There are a lot of other people that have assisted in various ways in the development of these products. Development is an ongoing process as each product evolves.
This documentation will begin with a Quick Start Guide followed by a more in-depth discussion. Finally, in this introduction, I'd like to list a variety of Web sites that you will find useful:
GNS3's primary Web site
Hacki's forum and more .net file to simulate the network for QoS, MPLS, IPV6, Mulitcast.
The most useful sites will be www.gns3.net and . The GNS3 site will be specific to GNS3. However, the hacki site is an invaluable forum where you'll find many how-to's and be able to interact with other users. I highly recommend that you visit both sites.
** You need a licensed cisco IOS image to run GNS3 and can also run PIX firewall.